diff --git a/include/minix/bitmap.h b/include/minix/bitmap.h
new file mode 100644
index 000000000..47da1283f
--- /dev/null
+++ b/include/minix/bitmap.h
@@ -0,0 +1,11 @@
+#ifndef _BITMAP_H
+#define _BITMAP_H
+
+/* Bit map operations to manipulate bits of a simple mask variable. */
+#define bit_set(mask, n)	((mask) |= (1 << (n)))
+#define bit_unset(mask, n)	((mask) &= ~(1 << (n)))
+#define bit_isset(mask, n)	((mask) & (1 << (n)))
+#define bit_empty(mask)		((mask) = 0)
+#define bit_fill(mask)		((mask) = ~0)
+
+#endif	/* _BITMAP_H */